c++ print vector without loop
template <typename T>
std::ostream& operator<< (std::ostream& out, const std::vector<T>& v) {
if ( !v.empty() ) {
out << '[';
std::copy (v.begin(), v.end(), std::ostream_iterator<T>(out, ", "));
out << "\b\b]";
}
return out;
}
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